Pump valve



2 Sheets-Sheet 1 J4, flZINVEXTOR.

.4 TTORA'E Y.

, M. CHASE rim? 'vALvE Filed NOV. 13, 1930 June 26, 1934.

June 26, 1934. V H M, CHASE 1,964,249

PUMP VALVE Filed NOV. 13, 1930 2 Sheets-Sheet 2 INVEYTOR.

' .4 TTORYEY.

Patented June 26, 1934 UNITED STATES PATENT OFFICE 7 1,964,249 PUMPIVALVE Harry M. Chase, Quincy,,Ill., assignor to Gardner- Denver Company, Quincy, 111., a corporation of Delaware I Application November 13, 1930, Serial No. 495,380

3 Claims. (01. 251-144) My invention relates to improvements in pump Slidable vertically of the stem 13 is a valve havvalves, particularly to that type of valve designed ing the head 10, the under face of which is conefor use in mud pumps. However, it will be shaped, in cross section, so asto seat upon the obvious that my invention is not confined to this concaved face 9 of the seat. The valve carries 5 particular use. a tubular extension 17 completely enclosing the The object of my invention is to providea pump upper end of the stem 13. Positioned upon the valve wherein the usual clattering of the parts head 10, and over the tubular extension 17, is a during its operation is prevented. flexible packing element 18, the outer edge of Another object of the invention is to provide a which extends beyond the head 10 and forms a 10 pump valve having a packing element which preseal preventing the passage of fluid between the vents, when acted upon by pressure fluid, the seat9 and head 10. leakage of fluid between the valve and its seat. In order to hold the packing element in place The packing, furthermore, serving as the means upon the head 10 there is provided a follower or for placing the several parts of the valve under retaining plate 19, slidable upon the extension 17.

15 tension so as to eliminate movement of one part The under face of the plate 19 carries a conewith respect to the other. shaped boss 20 which, when the plate is in place, The preferred form of the construction is shown tends to compress the packing element therein the accompanying drawings, in which: under, making a semi-rigid structure, including Figure 1 is a vertical sectional view through a the head, packing element and follower. 20 portion of a pump casing, showing therein the To look the follower 19 in place upon the stem, improved valve. and at the same time serving to press the boss 20 Figure 2 is a sectional view on the line 2-2 of of the plate 19 into the packing element, there is Figure l. provided an annular groove 21 around the exten- Figure 3 is a perspective view showing the sion 17 which receives therein a horseshoe locking 25 upper face of the follower plate. element 22. The free ends of this locking element Figure 4 is a similar view showing the under 22 are tapered so that it may be readily inserted face of the plate. within the groove and when forced in place depress Figure 5 is a perspective view of the locking the follower 19. element. The upper face of the follower 19 has an up- 30 Referring to the accompanying drawings in dewardly extending projection 23 which, upon the tail, the numeral 1 designates the inner wall of insertion of the locking element 22in its place, a pump casing, the valve adapted toform a paslies between the legs of the element. sage from the interior of the pump chamber to a To maintain the valve to its seat there is the chamber 2. Anopening is formedinthe chamber usual coiled spring 24, the upper end bearing 35 2 above the valve and closed by a suitable cap 3 against the under face of the cap 3, while its bolted to the pump wall in any suitable manner, lower end engages the upper face of the follower for example, by stud bolts 4. 19 and encloses both the locking element 22 and The wall 1 of the pump casing is provided with the upstanding boss 23. The spring thus being a tapered opening 5 which receives therein an held in a relatively fixed position with respect 40 annular valve seat 6. to the follower 19, and at the same time pre- The valve seat 6 is in the form of a plate having venting the withdrawal of the locking element 22 a plurality of openings 7 which surround a central from the groove 21. opening 8. The upper face of the valve seat 6 is Briefly, in operation, the valve is moved to concaved, as indicated at 9, for the reception and from its seat 9 either under the influence 45 thereupon ofavalve head 10. of tension exerted by the holding spring 24,

The central opening 8 is enlarged in its upper or by the fluid compressed in the pump. portion, as indicated at 11, to form a suitable Heretofore, in valves of this type, it has been shoulder 12. Positioned vertically within the found that when the packing element wears to. opening 8 is a valve stem 13, the lower end of some degree the parts become free to move with 50 which is reduced as at 14 to form a shoulder 15, respect to each other, thus creating an undesirawhich abuts against the shoulder 12 formed in the ble noise, and at the same time reducing very plate. The extreme lower'end of the stem 13 is materially the life of the valve and the packing threaded to receive thereon a suitable nut 16, element. The present-invention overcomes this locking the stem in place and against the defect, in that applicant has provided a valve 55 shoulder 12. wherein the parts are held in a relatively rigid position but under pressure exerted by the resiliency of the packing element.

From the foregoing it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit of or sacrificing any of the advantages in the invention.

What I claim, is:

1. In a pump valve, the combination of a seat and a valve having a stem, a packing element, a retaining plate for the packing element on the stem, a plate engaging spring surrounding the stem in spaced relation thereto, an upstanding projection on the plate, a locking and spacing key engageable with the stem and plate and disposed in the same plane as the projection, and said key and projection each having its entire outer surface snugly engaged by the portion of the spring that contacts with the plate to lock the key and to hold said spring in spaced relation to the stem.

2. In a pump valve, the combination of a seat and a valve having a stem, a packing element, a retaining plate for the packing element on the stem, a plate engaging spring surrounding the stem in spaced relation thereto, and a flat horseshoe shaped key engageable with the stem at the inner edge of said key and having its entire outer surface snugly engaged by the portion of the spring in contact with the plate.

3. In a pump valve, the combination of a seat and a valve having a stem, a packing element, a retaining plate for the packing element on the stem, a plate engaging spring surrounding the stem in spaced relation thereto, a flat horse-shoe shaped key engageable with the stem and plate, an upstanding projection on the plate positioned between the ends of said key, and the exterior surface of said key and projection forming a substantially continuous flange snugly engageable by the portion of the spring in contact with the plate.

HARRY M. CHASE. 

